Marine Color Reef HD Salinity Refractometer for Aquarium, Saltwater Hydrometer with Automatic Temperature Compensation, Durable Aluminum Body, Measures 0–100 PPT and 1.000–1.070 SG
* Ranges: 0-100 ppt of Salinity and 1.000 to 1.070 Specific Gravity
* Accuracy: +/- 1 ppt / 0.001 Specific Gravity
* Divisions: 1 ppt / 0.001 Specific Gravity
* Automatic Temperature Compensation (ATC)
* Sturdy design made of durable Aluminum, not "carbon" plastic